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Method for one-step separation of wood-grass fiber

A technology for wood, grass and fiber, which is applied in the field of one-step separation of wood and grass fibers, and can solve the problem that the tooth shape of the grinding blade is only suitable for wood raw materials.

Inactive Publication Date: 2005-12-21
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation of the prior art is only for wood raw materials, which are processed into wood chips by a chipper, and then screened by a screening machine to remove fine fragments and then sent to a thermal mill. Generally, sodium sulfite is not added, and the softening temperature is 160-180°C. Tooth shape only suitable for wood raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Its process steps are divided into one, obtain qualified wood unit and straw unit respectively, described qualified wood unit is that the wood raw material is processed into wood chips through a chipper, and then screened by a screening machine to remove fragments with a diameter less than 2mm, and the more Coarse wood chips are sent to be crushed again, and 0.5% of the total weight of sodium sulfite is added to the qualified wood unit; the qualified straw unit is to cut the straw raw material into a 30mm straw unit with a grass cutter, and then screen and remove the raw material through a screening machine. Broken leaves and silt impurities in the mixture are crushed with a pulverizer, and 0.5% sodium sulfite is added to account for the total weight; two, the wood unit: straw unit=50:30 is mixed and sent into the heat mill (model BW1111); three, Adjust the temperature and time in the process as follows: make the softening temperature 110°C, softening time 1min, in order...

Embodiment 2

[0010] Its process steps are divided into one, obtain qualified wood unit and straw unit respectively, described qualified wood unit is to process the wood raw material into wood chips through chipper, and then screen through the screening machine to remove too fine fragments with a diameter less than 2mm, The thicker wood chips are sent to be crushed again, and 7.75% of the total weight of sodium sulfite is added to the qualified wood unit; the qualified straw unit is the straw raw material cut into 40mm straw units by a grass cutter, and then screened by a screening machine Remove broken leaves and silt impurities in the raw material, crush with a pulverizer, add sodium sulfite accounting for 7.75% of the total weight; 2, mix uniformly according to wood unit: straw unit=60:40 and send it into the heat mill (model BW1111); 3. Adjust the temperature and time in the process as follows: make the softening temperature 145°C and the softening time 3 minutes, so that the two units o...

Embodiment 3

[0012] Its process steps are divided into one, obtain qualified wood unit and straw unit respectively, described qualified wood unit is to process the wood raw material into wood chips through chipper, and then screen through the screening machine to remove too fine fragments with a diameter less than 2mm, The thicker wood chips are sent to be crushed again, and sodium sulfite accounting for 15% of the total weight is added to the qualified wood unit; the qualified straw unit is the straw raw material cut into 50mm straw units by a grass cutter, and then screened by a screening machine Remove broken leaves and silt impurities in the raw material, crush with a pulverizer, and add 15% sodium sulfite accounting for the total weight; 2. Mix uniformly according to the wood unit: straw unit=70:50 and send it into the heat mill (model BW1111); 3. The softening device in the thermal grinder includes a digester, a material level controller, etc., and adjust the temperature and time in t...

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Abstract

The invention is a one step wood grass fiber separation technique. The technique steps are explained as follows: acquire qualified wood unit and straw unit and add with sodium sulphite; blend the units by the rate of wood unit 50-70 : grass unit 30-50 and send into the heat grinding machine; soften at 110-180 deg.C for 1-5 min to a needed softness, the heat grinding machine finally produces complete and uniform wood and grass fiber. The technique is half chemical half mechanical, making proper adjustment to the technique by adding proper chemical addition and adopting soften device, soften and blend wood and grass uniformly. The produced complex high intensity fiber sheet is of qualified dynamics performance meeting the national standard.

Description

technical field [0001] The invention relates to a one-step process for separating wood and grass fibers suitable for industrial production of wood / straw composite high and medium density fiberboards, and belongs to the field of wood-based panel manufacturing. Background technique [0002] At present, due to the protection of the environment and forest resources in various countries, the continuous development of the timber industry and the restrictions on the export of timber resources in some foreign countries, the price of timber raw materials continues to rise. Some wood-based panel companies have stopped working due to insufficient raw materials or high raw material prices. In order to solve these problems, researchers began to study the use of my country's rich resources of straw as raw materials to produce wood-based panels, such as high and medium density fiberboards. However, there are still some problems in the production of high and medium density fiberboards with ...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 周定国梅长彤徐咏兰张洋潘明珠周哓燕徐信武华毓坤
Owner NANJING FORESTRY UNIV
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